Mechano-regulated metal–organic framework nanofilm for ultrasensitive and anti-jamming strain sensing

Abstract

The development of ultrasensitive, anti-jamming, and durable sensors that can precisely distinguish different human body motions are of great importance for smart health monitoring and diagnosis. Physical implementation of such flexible sensors is still a challenge at the moment. Combining the designs of advanced material showing excellent electrochemical properties with the facilitative structure engineering, high-performance flexible sensors that satisfy both signal detecting and recognition requirements may be made possible. Here we report the first metal–organic framework-based strain sensor with accurate signal detection and noise-screening properties. Upon doping the tricarboxytriphenyl amine-based metal–organic framework nanofilm with iodine, the two-terminal device exhibits ultrahigh sensitivity with a gauge factor exceeding 10,000 in the 2.5% to 3.3% deformation range for over 5000 dynamic operating cycles and out-of-scale noise-screening capability. The high-performance strain sensor can easily differentiate the moderate muscle hyperspasmia from subtle swaying and vigorous sporting activities.

Highly Aligned, Anisotropic Carbon Nanofiber Films for Multidirectional Strain Sensors with Exceptional Selectivity

“…Flexible strain sensors have recently attracted tremendous attention due to their promising applications as wearable devices in personal health monitoring, artificial skin, sports performance monitoring, and human–machine interface . To satisfy the growing interests, significant efforts have been made to improve their overall performances.…”

Review of Printed Electrodes for Flexible Devices

“…Increasing demand for high performance devices, drives the development of alternative, or novel structures of devices and the use of new materials Wang et al, 2018). In recent years, flexible and stretchable electronics have developed at an unprecedented rate and are involved in various applications, including sensors (Chu et al, 2018;Pan et al, 2018), displays , solar cells Xi et al, 2017;Zhang et al, 2017), supercapacitors Wang M. et al, 2017), electronic skins (E-skins) (Lou et al, 2017;Bermúdez et al, 2018;Byun et al, 2018) and wearable electronics (Lee et al, 2017). Some applications are shown in Figure 1.…”

Physical sensors for skin‐inspired electronics

“…The changes in the intrinsic resistance mainly originate from the change of the electronic band structure during deformation, which can be found in many materials such as semiconductors (Si, Ge), carbon nanotubes (CNTs), graphene, and metal‐organic framework (MOF) . Based on the hole transfer and conduction mass shift due to stress, the change in resistance of semiconductor has been widely used in mechanical sensors .…”

“…F, Local density of states of I 2 @CuTCA MOF under strain. G, Evolution of the MOF device current as a function of strains . Copyright 2018, Springer Nature.…”

“…Under mechanical stimuli, the electronic band structure and the intrinsic resistivity of MOFs can be changed due to the changing of the pore size (Figure E‐G). Based on this, Pan et al reported the first MOF nanofilm‐based mechanical sensor, which met the ultrasensitive and antijamming criteria for health monitoring and infrastructure failure diagnosis …”